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Date: Fri, 22 Jun 2007 17:27:50 -0700 From: Yinghai Lu <Yinghai.Lu@....COM> To: Andi Kleen <ak@...e.de> Cc: Alan Cox <alan@...rguk.ukuu.org.uk>, "Eric W. Biederman" <ebiederm@...ssion.com>, Muli Ben-Yehuda <muli@...ibm.com>, Andrew Morton <akpm@...ux-foundation.org>, Vivek Goyal <vgoyal@...ibm.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] x86-64: disable the GART before allocate aperture Andi Kleen wrote: > On Saturday 23 June 2007 00:19:51 Alan Cox wrote: > The kdump kernel should be normally all <4GB anyways. You won't > need any IOMMU for its IO unless you O_DIRECT/sendfile out of /proc/kcore. > Just don't do that (but I suspect it won't work anyways) > > If it's not then swiotlb will also not work because it won't get > any memory <4GB. > > But I doubt this was YH's problem - the panic kernel memory > is always reserved and there shouldn't be any ongoing DMAs in this > area anyways. And what happens outside the kdump kernel shouldn't matter. > > I suspect he rather saw problems with non kdump kexec where we > can just shut down the GART properly beforehand. current I only test kexec only. So clean shut GART in first kernel will help. where is hook for shutdown? add one in dma_ops? YH - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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